[PATCH] D36504: [CodeGenPrepare][WIP] Convert uncond. branch to return into a return to help with shrink-wrapping

Fri Nov 3 08:35:44 PDT 2017

sfertile added a comment.

In https://reviews.llvm.org/D36504#914213, @qcolombet wrote:

> > I don't know enough about shrink wrapping to know if that is feasible or not. It doesn't seem practical to me, but maybe Francis or Quentin can comment?
>
> We'd actually want to do something relate to solve https://bugs.llvm.org/show_bug.cgi?id=33868.
>  We didn't have a chance to look at it yet.
>
> What I'd like to have is a way to simulate critical edge splitting in DT and only materialize the basic block if we end up inserting something into it.
>
> Don't know if splitting critical edges would solve what you are supporting here, though.

IIUC I think it would address our motivating examples, at least the for the shrink-wrap opportunities we were interested in .  Can you describe what you had planned a bit more? I believe this  is something either I or one of my team members would be willing to pick up.

Repository:
  rL LLVM

https://reviews.llvm.org/D36504